From: Valentin Schneider <valentin.schneider@arm.com>
To: Francesco Poli <invernomuto@paranoici.org>, linux-kernel@vger.kernel.org
Subject: Re: Question about sched_prio_to_weight values
Date: Thu, 10 Oct 2019 18:28:36 +0100 [thread overview]
Message-ID: <21c11aca-e531-7d72-9a70-f52c12d5d408@arm.com> (raw)
In-Reply-To: <20191007224143.d21abae57a3f32ac60afd53c@paranoici.org>
On 07/10/2019 21:41, Francesco Poli wrote:
> The differences are probably due to the different precision
> of the computations: I don't know the precision of those originally
> carried out by Ingo Molnar (single precision? double?), but calc(1)
> is an arbitrary precision calculator and, by default, performs
> calculations with epsilon = 1e-20 !
>
> Please note that, except for the first one, all the differing
> values obtained with the calc(1) script have slightly better
> errors than the ones found in kernel/sched/core.c ...
>
As always patches are welcome, but I don't know how much there is to gain
from a tiny error correction in those factors.
Out of curiosity, what led you to stare at those numbers?
>
> Thanks again for the clarification!
> Bye.
>
next prev parent reply other threads:[~2019-10-10 17:28 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-06 22:32 Question about sched_prio_to_weight values Francesco Poli
2019-10-07 9:13 ` Valentin Schneider
2019-10-07 20:41 ` Francesco Poli
2019-10-10 17:28 ` Valentin Schneider [this message]
2019-10-10 22:51 ` Francesco Poli
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